Vulnerability in Siemens Nucleus Net
CVE-2021-27393
A vulnerability has been identified in Nucleus NET (All versions), Nucleus ReadyStart V3 (All versions < V2013.08), Nucleus Source Code (Versions including affected DNS modules). The DNS client does not properly randomize UDP port numbers of DNS requests. That could allow an attacker to poison the DNS cache or spoof DNS resolving.
EPSS: 0.008 (52.6th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N.
Affected products
- Siemens Nucleus Net — versions All versions
- Siemens Nucleus_net
- Siemens Nucleus Readystart V3 — versions All versions < V2013.08
- Siemens Nucleus_readystart_v3
- Siemens Nucleus Source Code — versions Versions including affected DNS modules
- Siemens Nucleus_source_code
Weakness classification (CWE)
References
- productcert@siemens.com (x_refsource_MISC, Vendor Advisory)
Frequently asked questions
- What is CVE-2021-27393?
- CVE-2021-27393 is a medium-severity vulnerability in Siemens Nucleus Net, classified under Use of Insufficiently Random Values. CVSS score: 5.3/10. Published 2021-04-22.
- How severe is CVE-2021-27393?
- Medium severity. CVSS v3 base score is 5.3 out of 10.